Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22432b10ae5e2e2…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 20:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bce64841804c69c3dc40702796bb710c SHA-1: ef4ba2ced649b8dc6578ba325558c94944df49dd SHA-256: c22432b10ae5e2e2b95aac9072c7eaeecd07a5cb29f587bc4a62ebdfc6c9b36a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=calendar+june+2020+malaysia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371497/normal_601ee272a215e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450883/normal_5fe293337fe87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_6018ebd5a5ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_60544b9d4ef76.pdfIn PDF document text
    • http://ruginegil.22web.org/azhage_azhage_song_wapwon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_5fe9d5e1d7827.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/gdFOig4/best_interior_design_blogs_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/esjjfjc/xilodofoxugisarepavorejim.pdfIn PDF document text
    • http://zogufovitem.22web.org/christmas_cant_you_hear_the_church_bells_ringing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5febfbd39b444.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/lhjT57d/mario_and_luigi_colouring_pages.pdfIn PDF document text
    • http://lobikekifeviwo.iblogger.org/761033682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupisovid.epizy.com/51750303500.pdfIn PDF document text
    • http://daroxupotebaliw.rf.gd/broadsheet_best_cafes_port_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe943050-fd34-42b9-be44-f0760975a676/west_virginia_2nd_grade_math_standards.pdfIn PDF document text
    • http://lavaraf.epizy.com/galapevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89c3096-4b7b-410f-ba63-7cbe3c67c407/38874137138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c5e324-efcc-40f3-a79f-371d9f49b14d/les_misrables_cast.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 5544 bytes
SHA-256: 6fed7e110c5724f336249dcb2017d8f549cb14d2b2abffb7ee7ebed4a6824131
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 11264 bytes
SHA-256: c24fa7047f1e083453a3889fd72ed9bd0a303a0b1f1d1bbd1260083cf96cb2f2

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